Tumor protrusion assessment and clinical integration for enhanced mortality risk prediction in spontaneously ruptured hepatocellular carcinoma

Figure 1 Schematic illustration of the three quantitative tumor protrusion assessment methods. Protrusion area represents the absolute area of the tumor extending beyond the expected hepatic contour (A). Protrusion percentage is calculated as the ratio of the maximum protruding tumor diameter (B) to the maximum total tumor diameter (C). Protrusion diameter is the absolute maximum diameter of the protruding tumor portion (D). PA: Protrusion area; PP: Protrusion percentage; PD: Protrusion diameter.